For starter, not using common or dictionary words as passwords. If you can use separate passwords for each online account. Better to use a password manager. That way, you don't need to remember each password, and it'll also generate a strong password and store it for you. Also, it's good to keep in mind that, it's pretty hard to have good privacy online. Complete privacy is harder even. What you need is a good enough for your case. The more you go down the rabbit hole of making your footprints online private, the more inconvenient your online usage would be. The cyberspace is designed that way. Also, it helps to remember that generally anyone, starting from your ISP, govt., big tech, etc. can snoop on you. So you need to ask what is at stake? How much privacy do you really need and what you're prepared to do? You can switch to more privacy-aware alternatives to popular apps, and so on.